When my Dec 93 NA 2+2 developed a misfire on cylinder #6, I learnt a lot more about injectors than I ever wanted to know. In about 48 hours.

 

I pass this on in case it's useful to anyone else.

 

The original fault appeared to be a break in the wiring. That was traced and fixed but still the injector didn't come back. The informed opinion is that the arcing across the break as the original fault got worse caused the injector itself to fubar.

 

There are two types of injector: early and late; or Phase 1 and Phase 2 on some websites. The changeover was late 1993 or "model year 1994". Someone with access to FAST like Mr F will be able to tell you from your VIN for certain whether you need Phase 1 or 2.

 

* changeover dates from Mr F: TT changed 10/94, NA date 09/93

 

Some US sites refer to Phase 2 being from Model Year 1995 - 1996 but I guess the US car market introduces Model Years really early!

 

You can get a kit which allows Phase 2 injectors to be used with Phase 1 injector rails.

 

OEM injector part numbers I found on TwinTurbo.net

 

16600-15V02 - NA old style injector

16600-10Y01 - NA new style injector (previously 16600-10Y00)

16600-40P07 - TT old style injector

16600-21U00 - TT new style injector

 

NA OEM are 270cc. TT OEM are 370cc.

 

The tops are colour coded and 270cc for Phase 2 NA are red.

 

Also on TwinTurbo.net, I found a quote that said "“Generally when one injector fails, the others follow in short order."

 

Plus I discovered that almost no-one has a spare injector for a Phase 2 NA. Hardly surprising:

- NAs were never officially imported into UK

- Phase 2 are rarer than Phase 1 in the UK (UK stopped Zeds in '94 and US in '96)

- to get a single injector needs breaking a set of 6 and who wants 5 injectors?

- to get any benefit, you'd need to find an engine being broken with less miles than yours, with a set of known working injectors and someone who will break the set (if you insist on only having 1 - see above)

 

Buying new official from Nissan: £125.15 + VAT = £147.05 + delivery for ONE (and 3 weeks from Japan for the NA type since they were never officially needed in UK so not stocked here).

 

Breaker price (if you can find them) when I looked on eBay from a known UK Z Breaker was £29.99 + delivery. Sadly for me these were TT and Phase 1. Not even the renowned Eric had any of the right version.

 

I found that the original equipment manufacturer for the injectors for Nissan is JECS who have some link with Bosch but couldn't find any UK or Europe source.

 

I found a company called Deatschwerks who make (remanufacture?) injectors for several marques including Nissan. They are listed by several of our usual US parts friends. There range is also listed on three UK websites I found. One of them has an "interesting" reputation which I found after googling so I wouldn't touch them with a bargepole - the other two both said "about a week to get them in" and were charging near enough dollar prices in pounds. Fair enough, that still means a complete set of 6 injectors for not much more than twice the price of 1 official Nissan one (£350 vs £148).

 

I found and called Deatschwerks direct and they're incredibly helpful. They checked their stock and promised they could get a set out same day to be in UK within 48 hours. Claimed to be direct drop-in replacements for OEM including O-rings and a test chart. So it turned out - no problems in fitting to my Z (at least none that I've been told about). These are the guys who also do a Phase 2 to 1 conversion.

 

After the sun got round to Phoenix Arizona, I called ConceptZ and found Coz as helpful as ever and he also had some Deatschwerks in stock. I ordered from ConceptZ as I was looking at other Z parts as well but would have been very happy to order from Chris at Deatschwerks. He even emailed me the day after my phone call to see if he could help and get the order over to me any more quickly.

 

Of course, I could have bought just the one from Coz but since the plenum had to come off to replace the one, might as well do all of them as, knowing my luck, one of the others would go just after putting the whole lot back together.

 

Result from Coz, they arrived in the UK at the garage less than 48 hours after I placed the order. $365 for 6 plus delivery / duty.

 

Both Deatschwerks and ConceptZ know exactly what's needed for Z injectors - whether OEM drop-in replacement or upgrades. I have no hesitation in recommending them if you need a set of injectors like I did.

And I'm still pretty convinced that changing one with a s/h replacement is probably false economy.

Edited August 10, 201015 yr by Gio

Since the injectors were replaced, the strange wandering idle seems to have gone away.

 

It's Mike F's theory that the intermittent wiring fault was causing problems for the ECU and when the fault showed up, the ECU tried to compensate by [doing stuff] which caused the revs to rise. Fingers crossed, it hasn't recurred since so it sounds as if he was right.

 

So the old set of 5 working and 1 duff injector are now on eBay!

Interesting matey...... very interesting.

 

I have just had a failed injector, albeit, an a/m injector, but your theory/reasoning sounds spot-on. I will keep an eye on the replaced injector and if it goes bad in the near future, i know it will be a defective wire issue.

 

Cheerz for the info buddy......

 

Al.

I have a set of DeatchWerks Pintleless 550's in mine and they're great! :bow: